﻿//-----------------------------------------------------------------------
// <copyright file="SmartManipulatorHandle.cs" company="Nathan Miller">
// Copyright (c) Nathan Miller.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// </copyright>
//-----------------------------------------------------------------------
namespace TileTool.Base.Manipulator.Smart
{
    using TileTool.Common.Math;
    using TileTool.Input;
    using TileTool.Render;

    /// <summary>
    /// Smart manipulator handle which draws an ellipse or a rect depending
    /// on its state.
    /// 
    /// The ellipse's center will be at the position of the handle.
    /// 
    /// Hit testing will always be done with an ellipse.
    /// </summary>
    public class SmartManipulatorHandle : ManipulatorHandle
    {
        #region Constructor

        /// <summary>
        /// Default constructor.
        /// </summary>
        public SmartManipulatorHandle()
        {
            this.Size = new Size2D(0.0f, 0.0f);
            this.Ellipse = true;
        }

        #endregion

        #region Properties - Public

        /// <summary>
        /// Gets or sets the size of the ellipse.
        /// </summary>
        public Size2D Size
        {
            get;
            set;
        }

        /// <summary>
        /// Gets or sets if we should draw an ellipse.
        /// </summary>
        public bool Ellipse
        {
            get;
            set;
        }

        #endregion

        #region Methods - Public

        /// <summary>
        /// Draw the manipulator handle. The handle's matrix will be pushed
        /// onto the matrix stack when draw is called.
        /// </summary>
        /// <param name="renderData">Draw data.</param>
        public override void Draw(IRenderData renderData)
        {
            ICanvasRenderer renderer = renderData.Renderer;

            if (!this.Ellipse)
            {
                Size2D halfSize = this.Size.Half;
                Vector2D pos = this.Pos;

                pos.x -= halfSize.Width;
                pos.y -= halfSize.height;

                renderer.DrawFilledRect(pos, this.Size, this.DrawColor);
            }
            else
            {
                renderer.DrawFilledEllipse(this.Pos, this.Size, this.DrawColor);
            }
        }

        /// <summary>
        /// Test the passed point to see if it is inside of this handle.
        /// </summary>
        /// <param name="posLS">Mouse position in local space.</param>
        /// <returns>Returns true if the point is in the handle.</returns>
        public override bool TestPoint(Vector2D posLS)
        {
            if (!base.TestPoint(posLS))
            {
                return false;
            }

            Size2D halfSize = this.Size.Half;

            if ((halfSize.Width <= 0.0f) || (halfSize.Height <= 0.0f))
            {
                return false;
            }

            if (!CollisionUtility.PointInEllipse(
                Vector2D.Zero,
                halfSize.Width,
                halfSize.Height,
                posLS))
            {
                return false;
            }

            return true;
        }

        #endregion
    }
}
